Digital music distribution over the Internet is a tool of pirates, bootleggers and copyright thieves. Or else it's a legitimate new form of distribution which has the major record companies scared because it threatens their market share. It all depends who you believe.
The most common method of sending music over the Internet is by using the compressed file format known as MP3. MP3 can compress a three-minute song that would take up roughly 30MB on a CD, into 3MB ...